Simple pendulum clock is assumed to be better in use as compared to the conical pendulum. Why?

In a straightforward pendulum the measurements of the protest in suspension is essentially littler than the separation from the focal point of gravity of the question the pivot of suspension. This enables us to regard the mass as if it were a solitary point. 

In a cone shaped pendulum, the separation between the focal point of gravity of the swinging body and the hub of suspension is practically identical to the measurements of the body. 

The fundamental distinction between basic pendulum and cone shaped pendulum is that, in a basic pendulum, the separation between the focal point of gravity of the suspended body and the pivot of suspension is extensive contrasted with the measurements of the suspended body while, in a compound pendulum, the measurements of the suspended body are similar to the separation between the body's focal point of gravity and the hub of suspension.